I'm mainly wondering if I did the incidents right and if I should cut down on the phonetic spelling of the SCP's accent, but be harsh with your critiques-I won't take it personally!

I trimmed your thread summary above, since it was taking up a lot of space on the forum listing. Try to keep thread descriptions and titles under 7 lines so you don't visually crowd out other people's threads. ~Zyn

SCP-XXXX is to be placed in a standard humanoid containment cell, which can be sealed completely in foot-thick steel in the event of a containment breach.

1) Use metric units - nothing is a foot thick, that's an imperial unit. Secondly, planning for a containment breach is kind of redundant - you want to plan something that will never breach, your containment procedures should be written so that it won't breach.

It is ██ years of age, 200 pounds, and 2.1 meters tall.

Pounds is also an imperial unit.

I'm going to stop pulling specific examples here and move on to the real problem: the concept. This is just a guy who cannot die - it feels unoriginal (it's essentially just the main character in Lord Bung's Confinement series), and it's honestly just kind of boring. It's more of a super power than an anomaly. I honestly don't have much else to say on this - I see a lot of 'dudes who can't die' drafts, and this one doesn't really deviate from the norm at all. I'd suggest going back to the Ideas and Brainstorming forums to get your concept straightened out.